A86: Updated Sprite Routine

A86: Updated Sprite Routine

• To: assembly-86@lists.ticalc.org
• Subject: A86: Updated Sprite Routine
• From: Ricci Adams <ricci@chipsnet.com>
• Date: Mon, 01 Sep 1997 10:58:06 -0500
• Reply-To: assembly-86@lists.ticalc.org

  This is an updated version of the sprite routine I recived from Trent
Lillehaugen last week.  This version allows you to put the sprite in any of
the 8x8 squares on the screen.  To call this, use:

  ld b,(x value)
  ld c,(y value)
  ld hl,(picture)
  call DrawPic


Here is the routine:

DrawPic:
  ex de,hl           ;Put sprite in DE
  ld hl,$FC00        ;Point to video memory
    
  ld a,b             ;Put the X value in A

  ld b,c             ;Now both B and C has the Y value

  sra b
    
  sla c
  sla c
  sla c
  sla c
  sla c
  sla c
  sla c              ;Multiply BC by 2 (This is done by dividing B by 2 and
multiply C by 128)
  
  add hl,bc          ;Now add the Y value to the video memory
  
  ld b,0             
  ld c,a             ;Put the X value into C
  add hl,bc          ;Now add the X value to the video memory
  

  ld b,8
DrawPicLoop:
  push bc
  ld a,(de)
  ld (hl),a
  inc de
  ld b,0
  ld c,16
  add hl,bc
  pop bc
  djnz DrawPicLoop
  ret


If you have any suggestions, comments, or ways I could optimize this please send
it to ricci@chipsnet.com, Thanks!

                                                                - Ricci Adams

• A86: Better Aligned Sprite Routine
• From: Dan Eble <eble@cis.ohio-state.edu>

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